Osama Bin Laden Is Dead -- Where Are the Other 9/11 Perpetrators?

Osama Bin Laden is dead – but what has become of the other men responsible for 9/11? While 19 hijackers were among the nearly 3,000 people who died in the Sept. 11, 2001 attacks, many of those said to be responsible were nowhere near Washington or New York that morning. Some of the prime actors, like Osama, have been captured or killed, while others remain at large nearly ten years later.

Mohamed Atta The 33-year-old pilot of the American Airlines plane that crashed into the North Tower of the World Trade Center was a ringleader of the coordinated hijacking of four planes. Born and raised in Egypt, he moved to Germany in the early '90s and became part of the Islamic extremist "Hamburg Cell" later that decade. He met Al Qaeda leader Osama Bin Laden in Afghanistan and was recruited to become part of a plot to receive pilot training and then crash hijacked jets into U.S. targets. He died with 18 other hijackers on Sept. 11.

Mohammed Atef Al Qaeda's alleged military chief met with 9/11 planner Khalid Sheikh Mohammed and Al Qaeda leader Osama Bin Laden in 1999 to help plot the 9/11 attacks. He also met with several of the men who would later hijack the jets, including Mohamed Atta, to explain their mission. By then he was already wanted in the U.S. for his alleged role in the 1998 embassy bombings in Africa. He was killed in a U.S. airstrike in Afghanistan in November 2001.

Zacarias Moussaoui The reputed "20th hijacker" has been sentenced to life in prison without parole for his role in the 9/11 plot. Born in France to Moroccan parents, he was arrested in Minnesota prior to the attacks on an immigration violation. Though Moussaoui had received flight training like the other hijackers and money from Ramzi Binalshibh, he has denied that he was part of the 9/11 plot, saying he was part of another Al Qaeda plan for an attack after 9/11. Now 42, he is in a supermax federal prison in Colorado.